<template>
	<view>
    <!--使用自定义的搜索组件 -->
    <my-search :bgcolor="'pink'" :radius="10" @MyClick="gotoSearch"></my-search>
		<view class="scroll-view-container">
      <!-- 左侧的滑动区域 -->
      <scroll-view class="left-scroll-view" scroll-y="true"  :style="{height:wh+'px'}">
        <block v-for="(item,i) in cateList" :key="i">
          <view :class="['left-scroll-view-item',i === active ? 'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <!-- 右侧的滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh+'px'}" :scroll-top="scrollTop">
        <!-- 二级分类 -->
        <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- 标题 -->
          <view class="cate-lv2-title">
           / {{item2.cat_name}} / 
          </view>
          <!-- 三级分类 -->
          <view class="cate-lv3-list">
            <!-- 三级分类的项 -->
            <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <image :src="item3.cat_icon"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
		</view>
	</view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  
	export default {
    mixins:[badgeMix],
		data() {
			return {
        // 当前设备可用的高度
        wh:0,
        cateList:[],
        active:0,
        // 二级分类的数组
        cateLevel2:[],
        scrollTop:0
			};
		},
    onLoad() {
     const sysInfo =  uni.getSystemInfoSync()
     this.wh=sysInfo.windowHeight - 50
     
     this.getCateList()
    },
    methods:{
      // 获取分类列表
     async getCateList(){
       const {data:res} = await uni.$http.get('/api/public/v1/categories')
       if(res.meta.status !== 200) return uni.$showMsg()
       this.cateList=res.message
       // 二级分类
       this.cateLevel2 = res.message[0].children
      },
      activeChanged(i){
        this.active = i
        // 重新为二级分类赋值
        this.cateLevel2 =this.cateList[i].children
        this.scrollTop= this.scrollTop===0? 1 :0
      },
      // 跳转到商品页面
      gotoGoodsList(item3){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid='+item3.cat_id
        })
      },
      // 跳转搜索界面
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
	}
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  
  .left-scroll-view{
    width: 120px;
    
      
    .left-scroll-view-item{
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active{
        background-color: #FFFFFF;
        position: relative;
        
        &::before{
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
  }
}

.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}

.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  
  .cate-lv3-item{
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    
    image{
    width: 60px;
    height: 60px;
    }
    text{
      font-size: 12px;
    }
  }
}
</style>
